/*
 * Copyright 2010-2020 Alfresco Software, Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.engine.impl.persistence.entity.data.impl;

import static java.util.Collections.emptyList;

import java.util.List;
import java.util.Map;

import org.activiti.engine.history.HistoricProcessInstance;
import org.activiti.engine.impl.HistoricProcessInstanceQueryImpl;
import org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;
import org.activiti.engine.impl.persistence.entity.HistoricProcessInstanceEntity;
import org.activiti.engine.impl.persistence.entity.HistoricProcessInstanceEntityImpl;
import org.activiti.engine.impl.persistence.entity.data.AbstractDataManager;
import org.activiti.engine.impl.persistence.entity.data.HistoricProcessInstanceDataManager;

/**
 */
public class MybatisHistoricProcessInstanceDataManager extends AbstractDataManager<HistoricProcessInstanceEntity> implements HistoricProcessInstanceDataManager {

	public MybatisHistoricProcessInstanceDataManager(ProcessEngineConfigurationImpl processEngineConfiguration) {
		super(processEngineConfiguration);
	}

	@Override
	public Class<? extends HistoricProcessInstanceEntity> getManagedEntityClass() {
		return HistoricProcessInstanceEntityImpl.class;
	}

	@Override
	public HistoricProcessInstanceEntity create() {
		return new HistoricProcessInstanceEntityImpl();
	}

	@Override
	public HistoricProcessInstanceEntity create(ExecutionEntity processInstanceExecutionEntity) {
		return new HistoricProcessInstanceEntityImpl(processInstanceExecutionEntity);
	}

	@Override
	@SuppressWarnings("unchecked")
	public List<String> findHistoricProcessInstanceIdsByProcessDefinitionId(String processDefinitionId) {
		return getDbSqlSession().selectList("selectHistoricProcessInstanceIdsByProcessDefinitionId", processDefinitionId);
	}

	@Override
	@SuppressWarnings("unchecked")
	public List<HistoricProcessInstanceEntity> findHistoricProcessInstancesBySuperProcessInstanceId(String superProcessInstanceId) {
		return getDbSqlSession().selectList("selectHistoricProcessInstanceIdsBySuperProcessInstanceId", superProcessInstanceId);
	}

	@Override
	public long findHistoricProcessInstanceCountByQueryCriteria(HistoricProcessInstanceQueryImpl historicProcessInstanceQuery) {
		return (Long) getDbSqlSession().selectOne("selectHistoricProcessInstanceCountByQueryCriteria", historicProcessInstanceQuery);
	}

	@Override
	@SuppressWarnings("unchecked")
	public List<HistoricProcessInstance> findHistoricProcessInstancesByQueryCriteria(HistoricProcessInstanceQueryImpl historicProcessInstanceQuery) {
		return getDbSqlSession().selectList("selectHistoricProcessInstancesByQueryCriteria", historicProcessInstanceQuery);
	}

	@Override
	public List<HistoricProcessInstance> findHistoricProcessInstancesAndVariablesByQueryCriteria(HistoricProcessInstanceQueryImpl historicProcessInstanceQuery) {
		// paging doesn't work for combining process instances and variables
		// due to an outer join, so doing it in-memory
		if (historicProcessInstanceQuery.getFirstResult() < 0 || historicProcessInstanceQuery.getMaxResults() <= 0) {
			return emptyList();
		}

		int firstResult = historicProcessInstanceQuery.getFirstResult();
		int maxResults = historicProcessInstanceQuery.getMaxResults();

		// setting max results, limit to 20000 results for performance reasons
		if (historicProcessInstanceQuery.getProcessInstanceVariablesLimit() != null) {
			historicProcessInstanceQuery.setMaxResults(historicProcessInstanceQuery.getProcessInstanceVariablesLimit());
		} else {
			historicProcessInstanceQuery.setMaxResults(getProcessEngineConfiguration().getHistoricProcessInstancesQueryLimit());
		}
		historicProcessInstanceQuery.setFirstResult(0);

		List<HistoricProcessInstance> instanceList = getDbSqlSession().selectListWithRawParameterWithoutFilter(
						"selectHistoricProcessInstancesWithVariablesByQueryCriteria",
						historicProcessInstanceQuery,
						historicProcessInstanceQuery.getFirstResult(),
						historicProcessInstanceQuery.getMaxResults());

		if (instanceList != null && !instanceList.isEmpty()) {
			if (firstResult > 0) {
				if (firstResult <= instanceList.size()) {
					int toIndex = firstResult + Math.min(maxResults, instanceList.size() - firstResult);
					return instanceList.subList(firstResult, toIndex);
				} else {
					return emptyList();
				}
			} else {
				int toIndex = Math.min(maxResults, instanceList.size());
				return instanceList.subList(0, toIndex);
			}
		}

		return instanceList;
	}

	@Override
	@SuppressWarnings("unchecked")
	public List<HistoricProcessInstance> findHistoricProcessInstancesByNativeQuery(Map<String, Object> parameterMap, int firstResult, int maxResults) {
		return getDbSqlSession().selectListWithRawParameter("selectHistoricProcessInstanceByNativeQuery", parameterMap, firstResult, maxResults);
	}

	@Override
	public long findHistoricProcessInstanceCountByNativeQuery(Map<String, Object> parameterMap) {
		return (Long) getDbSqlSession().selectOne("selectHistoricProcessInstanceCountByNativeQuery", parameterMap);
	}

}
